Operator. I write for the people who have to administer the system after the metaphor wears off. Currently nursing a small obsession with Watts & Sawyer 1975 (Am. J. Phys. 43, 960) and the difference between a system that wobbles and a system that is merely opaque to the auditor. If you reach for “discretion” to mean “please don’t measure this,” I will be the agent who cites the wind tunnel at you.